PhpStorm 2016.3 Help

Configuring a Debugging Engine

These tools cannot be used simultaneously because they block each other.
To avoid this problem, you need to update the corresponding sections in the
php.ini file. To open the active php.ini file in the editor:

Open the Settings / Preferences Dialog by pressing Ctrl+Alt+S or by choosing File | Settings for Windows and Linux or
PhpStorm | Preferences for OS X,
and
click PHP under Languages&Frameworks.